Permit Required? Required
Typical Fee Range $1,000–$2,500 Includes $150–$200 ILP plus structural and trade permit fees.
Fee Method Project-based
Apply Online Apply at Indianapolis Department of Business and Neighborhood Services →

What's Required in Indianapolis

  • ADUs must be between 220 and 800 square feet
  • ADU cannot exceed 50% of the primary dwelling's living space
  • Property must be owner-occupied (either main house or ADU)
  • Must include independent kitchen and bathroom facilities
  • ADU must comply with all standard setbacks for accessory structures in the specific zone
  • Independent utility connections (water/sewer) are required per local standards

How to Get a ADU Permit in Indianapolis

1

Step 1: Zoning

Verify ADU eligibility and setbacks for your parcel via MapIndy.

2

Step 2: Architecture

Hire an architect to create full construction documents.

3

Step 3: Portal Submission

Submit 'New Accessory Structure' for the ADU unit via ACA.

4

Step 4: Fee Payment

Pay structural ($697+), ILP, and trade fees online.

5

Step 5: Inspections

Schedule full sequence: Foundation, Framing, Rough MEP, and Final.

Frequently Asked Questions

Yes, provided you meet size (220-800 sq ft) and owner-occupancy requirements.
Fees typically start around $1,000 for building and utility permits.
800 square feet or 50% of the main house, whichever is smaller.